/* GYANAGI IIT • NEET — black / gold / white. One accent, hairline structure, serif identity. */
:root{
  --ink:#000;--raise:#0f0e0c;--raise2:#181713;--rule:#2b2924;--rule2:#3a372f;
  --paper:#f4f2ec;--muted:#9c978b;--faint:#6f6b61;
  --gold:#c8a04a;--gold2:#e2c27a;--goldd:#2a2213;
  --ok:#7dbe8c;--okd:#122017;--bad:#d9776b;--badd:#2a1411;--warn:#d8b35a;
  --serif:Georgia,"Times New Roman","Noto Serif Devanagari",serif;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans Devanagari","Noto Sans",sans-serif;
  --r:10px;--rail:232px;color-scheme:dark}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--ink);color:var(--paper);font:15px/1.6 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
html[lang=hi] body{line-height:1.75}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--gold2)}
h1,h2,h3{font-family:var(--serif);font-weight:400;line-height:1.25;margin:0 0 .5em}
h1{font-size:1.9rem;letter-spacing:-.01em}h2{font-size:1.35rem}h3{font-size:1.08rem}
p{margin:0 0 .8em}
:focus-visible{outline:2px solid var(--gold);outline-offset:2px;border-radius:6px}
.skip{position:absolute;left:-999px}.skip:focus{left:10px;top:10px;z-index:99;background:var(--raise2);padding:8px 12px}
.num{font-variant-numeric:tabular-nums}
.muted{color:var(--muted)}.faint{color:var(--faint)}.small{font-size:.87rem}.tiny{font-size:.78rem}
.gold{color:var(--gold)}.ok{color:var(--ok)}.bad{color:var(--bad)}
.hidden{display:none!important}

/* ---------------------------------------------------------------- shell */
.rail{position:fixed;inset:0 auto 0 0;width:var(--rail);border-right:1px solid var(--rule);display:flex;flex-direction:column;padding:20px 14px;gap:18px;overflow-y:auto;background:var(--ink);z-index:20}
.brand{display:flex;gap:11px;align-items:center;text-decoration:none;color:var(--paper)}
.om{width:38px;height:38px;flex:none;border:1px solid var(--gold);border-radius:50%;display:grid;place-items:center;color:var(--gold);font:22px/1 "Nirmala UI","Kohinoor Devanagari","Devanagari Sangam MN","Noto Sans Devanagari","Mangal",var(--serif)}
.brand b{display:block;font:600 .92rem/1.2 var(--sans);letter-spacing:.2em}
.brand span{display:block;font:1rem/1.2 var(--serif);color:var(--gold)}
.nav{display:flex;flex-direction:column;gap:2px}
.nav a{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:8px;color:var(--muted);text-decoration:none;min-height:40px}
.nav a:hover{color:var(--paper);background:var(--raise)}
.nav a[aria-current=page]{color:var(--paper);background:var(--raise2);box-shadow:inset 2px 0 0 var(--gold)}
.nav .ic{width:20px;text-align:center;color:var(--gold);opacity:.85}
.nav hr{border:0;border-top:1px solid var(--rule);margin:8px 4px}
.rail .foot{margin-top:auto;display:grid;gap:8px}
.top{display:none}
main{margin-left:var(--rail);padding:28px clamp(16px,4vw,48px) 96px;max-width:calc(1040px + var(--rail));min-height:100vh}
.tabbar{display:none}

@media (max-width:900px){
  .rail{display:none}
  main{margin-left:0;padding:16px 16px calc(92px + env(safe-area-inset-bottom))}
  .top{display:flex;position:sticky;top:0;z-index:20;align-items:center;gap:10px;padding:10px 16px;background:rgba(0,0,0,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--rule)}
  .top .brand b{font-size:.8rem}.top .brand span{font-size:.92rem}
  .top .sp{flex:1}
  .tabbar{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;left:0;right:0;bottom:0;z-index:25;background:rgba(0,0,0,.97);border-top:1px solid var(--rule);padding:4px 4px calc(4px + env(safe-area-inset-bottom))}
  .tabbar a,.tabbar button{display:flex;flex-direction:column;align-items:center;gap:2px;padding:7px 2px;min-height:52px;color:var(--muted);text-decoration:none;font-size:.72rem;background:none;border:0;cursor:pointer}
  .tabbar .ic{color:var(--gold);font-size:1.05rem}
  .tabbar [aria-current=page]{color:var(--paper)}
  h1{font-size:1.55rem}
}

/* ---------------------------------------------------------------- controls */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:9px 16px;border-radius:9px;border:1px solid var(--gold);background:var(--gold);color:#16120a;font-weight:650;cursor:pointer;text-decoration:none;font-size:.93rem;line-height:1.2}
.btn:hover{background:var(--gold2);border-color:var(--gold2)}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn.line{background:transparent;color:var(--paper);border-color:var(--rule2)}
.btn.line:hover{border-color:var(--gold);color:var(--gold2)}
.btn.quiet{background:transparent;border-color:transparent;color:var(--gold2);padding-inline:8px}
.btn.quiet:hover{text-decoration:underline}
.btn.sm{min-height:36px;padding:6px 12px;font-size:.86rem}
.btn.wide{width:100%}
.seg{display:inline-flex;border:1px solid var(--rule2);border-radius:9px;overflow:hidden;flex-wrap:wrap}
.seg button{min-height:38px;padding:6px 14px;background:transparent;border:0;color:var(--muted);cursor:pointer}
.seg button[aria-pressed=true]{background:var(--goldd);color:var(--gold2)}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.between{justify-content:space-between}
.stack>*+*{margin-top:12px}
label.f{display:grid;gap:5px;font-size:.84rem;color:var(--muted)}
label.f>*{color:var(--paper)}
input[type=number],input[type=text],input[type=date],input[type=time],select,textarea{width:100%;min-height:42px;background:var(--raise);border:1px solid var(--rule2);border-radius:8px;padding:8px 10px}
textarea{min-height:90px}
.grid{display:grid;gap:14px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(3,minmax(0,1fr))}.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:760px){.g2,.g3{grid-template-columns:minmax(0,1fr)}.g4{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* ---------------------------------------------------------------- surfaces: hairline sections, few boxes */
.sec{border-top:1px solid var(--rule);padding-top:18px;margin-top:26px}
.sec:first-child{border-top:0;margin-top:0;padding-top:0}
.sec>h2{display:flex;justify-content:space-between;align-items:baseline;gap:10px;flex-wrap:wrap}
.panel{border:1px solid var(--rule);border-radius:var(--r);padding:16px;background:var(--raise)}
.note{border-left:2px solid var(--gold);padding:8px 12px;background:var(--raise);border-radius:0 8px 8px 0}
.warnbox{border-left:2px solid var(--bad);padding:8px 12px;background:var(--badd);border-radius:0 8px 8px 0}
.chip{display:inline-flex;align-items:center;gap:5px;padding:2px 9px;border-radius:999px;border:1px solid var(--rule2);font-size:.76rem;color:var(--muted);white-space:nowrap}
.chip.g{border-color:transparent;background:var(--goldd);color:var(--gold2)}
.chip.ok{border-color:transparent;background:var(--okd);color:var(--ok)}
.chip.bad{border-color:transparent;background:var(--badd);color:var(--bad)}
.bar{height:4px;background:var(--rule);border-radius:4px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--gold)}
.bar.ok i{background:var(--ok)}.bar.bad i{background:var(--bad)}
.empty{color:var(--muted);padding:22px 0}

/* ---------------------------------------------------------------- Today */
.hello{font:1.55rem/1.3 var(--serif);margin:0 0 4px;max-width:30ch}
.hello em{font-style:normal;color:var(--gold)}
.tracksw{margin:14px 0 22px}
@media (max-width:520px){.tracksw{display:grid;grid-template-columns:repeat(3,1fr);width:100%}.tracksw button{padding:6px 4px;font-size:.82rem;line-height:1.25}}
.ledger{border-top:1px solid var(--rule2)}
.lrow{display:grid;grid-template-columns:minmax(120px,170px) minmax(0,1fr) auto;gap:6px 22px;padding:16px 0 14px;border-bottom:1px solid var(--rule);position:relative}
.lrow .sub{color:var(--muted);font-size:.86rem}
.lrow .topic{font:1.18rem/1.3 var(--serif)}
.lrow .why{font-size:.82rem;color:var(--faint);margin-top:2px}
.lrow ul{list-style:none;margin:8px 0 0;padding:0;display:grid;gap:4px}
.lrow li{display:flex;gap:10px;align-items:center;font-size:.92rem}
.lrow li .tick{width:18px;height:18px;border:1px solid var(--rule2);border-radius:5px;display:grid;place-items:center;font-size:.72rem;cursor:pointer;background:transparent;color:var(--ok);padding:0;flex:none}
.lrow li.done{color:var(--muted)}.lrow li.done .tick{border-color:var(--ok);background:var(--okd)}
.lrow li .part{color:var(--faint);font-size:.82rem}
.lrow .go{align-self:start;display:flex;flex-direction:column;gap:6px;align-items:flex-end}
.lrow .fill{position:absolute;left:0;bottom:-1px;height:1px;background:var(--gold)}
@media (max-width:760px){.lrow{grid-template-columns:minmax(0,1fr)}.lrow .go{flex-direction:row;align-items:center}}
.stats{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px;margin-top:22px}
.stat b{display:block;font:1.6rem/1.15 var(--serif);font-variant-numeric:tabular-nums}
.stat span{font-size:.8rem;color:var(--muted)}
@media (max-width:760px){.stats{grid-template-columns:repeat(2,minmax(0,1fr))}}
.next{margin-top:22px;padding:16px 18px;border:1px solid var(--rule2);border-radius:var(--r)}
.next p{font:1.08rem/1.5 var(--serif);margin:0 0 10px}
.modes{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:8px;margin-top:22px}
.modes a{display:grid;gap:2px;padding:12px 10px;border:1px solid var(--rule);border-radius:9px;text-decoration:none;color:var(--paper);min-height:64px}
.modes a:hover{border-color:var(--gold)}
.modes a span{font-size:.76rem;color:var(--muted)}
@media (max-width:900px){.modes{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media (max-width:520px){.modes{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* ---------------------------------------------------------------- syllabus */
details.subj{border-bottom:1px solid var(--rule)}
details.subj>summary{list-style:none;cursor:pointer;display:grid;grid-template-columns:minmax(0,1fr) 120px 48px;gap:12px;align-items:center;padding:14px 0;min-height:48px}
details.subj>summary::-webkit-details-marker{display:none}
details.subj>summary h3{margin:0}
details.ch{margin:0 0 0 2px;border-top:1px solid var(--rule)}
details.ch>summary{list-style:none;cursor:pointer;display:grid;grid-template-columns:minmax(0,1fr) 90px 44px;gap:10px;align-items:center;padding:11px 0 11px 12px;min-height:44px}
details.ch>summary::-webkit-details-marker{display:none}
details.ch[open]>summary{color:var(--gold2)}
.trow{display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:10px;align-items:center;padding:9px 0 9px 26px;border-top:1px dashed var(--rule)}
.trow a{color:var(--paper);text-decoration:none}.trow a:hover{color:var(--gold2)}
.st{font-size:.74rem;padding:1px 8px;border-radius:999px;white-space:nowrap;border:1px solid var(--rule2);color:var(--muted)}
.st.learning,.st.practicing{color:var(--paper)}
.st.weak{color:var(--bad);border-color:var(--bad)}
.st.due{color:var(--warn);border-color:var(--warn)}
.st.strong{color:var(--ok);border-color:transparent;background:var(--okd)}
.st.mastered{color:#16120a;background:var(--gold);border-color:var(--gold)}
@media (max-width:600px){details.subj>summary{grid-template-columns:minmax(0,1fr) 70px 40px}details.ch>summary{grid-template-columns:minmax(0,1fr) 60px 40px}.trow{padding-left:12px}}

/* ---------------------------------------------------------------- learn */
.crumbs{font-size:.84rem;color:var(--muted);margin-bottom:6px}
.crumbs a{color:var(--muted)}
ol.points{padding-left:1.3em;margin:0}ol.points li{margin:.35em 0;max-width:72ch}
ul.formulas{list-style:none;padding:0;margin:0;display:grid;gap:6px}
ul.formulas li{font:1rem/1.5 var(--serif);padding:6px 10px;border-left:2px solid var(--gold);background:var(--raise)}
ul.mistakes{padding-left:1.1em;margin:0}ul.mistakes li{margin:.3em 0;color:#e6c2bb}

/* ---------------------------------------------------------------- questions */
.qhead{display:flex;justify-content:space-between;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:10px}
.stem{font:1.1rem/1.55 var(--serif);white-space:pre-line;margin:0 0 14px;max-width:70ch}
.opts{display:grid;gap:8px}
.opt{display:flex;gap:12px;align-items:flex-start;width:100%;text-align:left;padding:12px 14px;border-radius:9px;border:1px solid var(--rule2);background:var(--raise);cursor:pointer;min-height:48px;line-height:1.45}
.opt:hover:not(:disabled){border-color:var(--gold)}
.opt b{flex:none;color:var(--gold);width:1.3em}
.opt[aria-pressed=true]{border-color:var(--gold);background:var(--goldd)}
.opt.right{border-color:var(--ok);background:var(--okd)}
.opt.wrong{border-color:var(--bad);background:var(--badd)}
.opt:disabled{cursor:default}
.numin{display:flex;gap:10px;flex-wrap:wrap}.numin input{max-width:220px}
.expl{margin-top:14px;padding:12px 14px;border-left:2px solid var(--gold);background:var(--raise);border-radius:0 9px 9px 0}
.conf{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:12px 0 0;font-size:.86rem;color:var(--muted)}
.etype{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
.etype button{min-height:34px;padding:4px 11px;border-radius:999px;border:1px solid var(--rule2);background:transparent;color:var(--muted);cursor:pointer;font-size:.82rem}
.etype button[aria-pressed=true]{border-color:var(--bad);color:var(--bad);background:var(--badd)}
.timer{font-variant-numeric:tabular-nums;color:var(--muted);font-size:.86rem}
.progress{height:2px;background:var(--rule);margin:0 0 16px}.progress i{display:block;height:100%;background:var(--gold)}

/* ---------------------------------------------------------------- test runner */
.trun{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:22px;align-items:start}
.palette{position:sticky;top:20px;border:1px solid var(--rule);border-radius:var(--r);padding:14px}
.pgrid{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;margin:10px 0}
.pgrid button{min-height:38px;border-radius:7px;border:1px solid var(--rule2);background:transparent;color:var(--muted);cursor:pointer;font-variant-numeric:tabular-nums}
.pgrid .answered{background:var(--okd);border-color:var(--ok);color:var(--ok)}
.pgrid .unanswered{border-color:var(--bad);color:var(--bad)}
.pgrid .marked{background:#1d1630;border-color:#9a83d8;color:#c7b6f2}
.pgrid .answered-marked{background:#1d1630;border-color:var(--ok);color:var(--ok)}
.pgrid .cur{outline:2px solid var(--gold);outline-offset:1px}
.legend{display:grid;gap:4px;font-size:.78rem;color:var(--muted)}
.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px;vertical-align:-1px;border:1px solid}
.clock{font:1.5rem/1 var(--serif);font-variant-numeric:tabular-nums}
.clock.low{color:var(--bad)}
@media (max-width:900px){.trun{grid-template-columns:minmax(0,1fr)}.palette{position:static;order:-1}.pgrid{grid-template-columns:repeat(8,1fr)}}
@media (max-width:420px){.pgrid{grid-template-columns:repeat(6,1fr)}}

/* ---------------------------------------------------------------- tables, charts */
.tbl{width:100%;border-collapse:collapse;font-size:.9rem}
.tbl th{text-align:left;font-weight:500;color:var(--muted);font-size:.8rem;padding:6px 8px;border-bottom:1px solid var(--rule2)}
.tbl td{padding:8px;border-bottom:1px solid var(--rule);vertical-align:top}
.tbl td.n,.tbl th.n{text-align:right;font-variant-numeric:tabular-nums}
.scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.hbar{display:grid;grid-template-columns:minmax(90px,150px) minmax(0,1fr) 52px;gap:10px;align-items:center;margin:7px 0;font-size:.9rem}
.cols{display:flex;align-items:flex-end;gap:3px;height:90px;border-bottom:1px solid var(--rule2)}
.cols i{flex:1;background:var(--gold);min-height:1px;border-radius:2px 2px 0 0;opacity:.85}
.cols i.none{background:var(--rule);opacity:1}
.cal{display:grid;grid-template-columns:repeat(14,1fr);gap:3px}
.cal i{aspect-ratio:1;border-radius:3px;background:var(--rule)}
.cal i.on{background:var(--gold)}
.finding{padding:12px 0;border-top:1px solid var(--rule)}
.finding:first-of-type{border-top:0}

/* ---------------------------------------------------------------- recall cards */
.card{border:1px solid var(--rule2);border-radius:var(--r);padding:22px;min-height:180px;display:flex;flex-direction:column;gap:12px}
.card .front{font:1.2rem/1.4 var(--serif)}
.card ul{margin:0;padding-left:1.2em}.card li{margin:.3em 0}

/* ---------------------------------------------------------------- overlays */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.72);display:grid;place-items:center;padding:16px;z-index:60}
.modal .box{width:min(460px,100%);max-height:calc(100vh - 32px);overflow:auto;background:var(--raise2);border:1px solid var(--rule2);border-radius:12px;padding:20px}
.sheet{position:fixed;inset:auto 0 0 0;z-index:55;background:var(--raise2);border-top:1px solid var(--rule2);border-radius:14px 14px 0 0;padding:14px 16px calc(18px + env(safe-area-inset-bottom));max-height:80vh;overflow:auto}
.sheet .nav a{min-height:46px}
.scrim{position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:50}
.toast{position:fixed;left:50%;bottom:calc(84px + env(safe-area-inset-bottom));transform:translateX(-50%);background:var(--paper);color:#000;padding:9px 16px;border-radius:9px;font-size:.9rem;opacity:0;pointer-events:none;transition:opacity .2s;z-index:70;max-width:90vw}
.toast.show{opacity:1}
.boot{display:grid;place-items:center;min-height:60vh;text-align:center;gap:12px}
.boot .om{width:56px;height:56px;font-size:32px}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}